[wtn]

Rake::TestTask runs the tests through a single shell string. The test files and the -I load path are wrapped in double quotes, but with the default :rake loader the path to rake_test_loader.rb is interpolated bare. When rake is installed under a directory whose name contains a space (a home directory with a space, or a project such as ~/My Projects/app using bundle config path vendor/bundle), the shell splits the loader path and rake test fails:

ruby: No such file or directory -- /path/to/My (LoadError)
rake aborted!
Command failed with status (1)

This is a regression. The loader path was quoted from 87e39db (2009) until 063950d (#357, "Simplify default rake test loader") replaced "\"#{rake_loader}\"" with an unquoted -r argument, and 37635e6 later changed that argument to the current form without adding quotes.

Fix

This change wraps the loader path in double quotes in TestTask#run_code, restoring the quoting that 063950d removed and matching how file_list_string and ruby_opts_string quote their paths.

A functional test runs a test task from a copy of lib under a temporary directory named rake with space.